Apollodorus is an impact crater on Mercury. It is located near the center of Pantheon Fossae, which is a system of radial grabens situated in the inner part of the Caloris basin. The floor, rim and walls of Apollodorus expose a low reflectance material (LRM) excavated during the impact from beneath the light volcanic plains, which cover the central part of the Caloris.[1]

It is not currently known whether it played a role in the fossae's formation or if its location is merely a coincidence, although no graben appears to cut the crater rim, and the dark impact ejecta partially covers grabens suggesting that Apollodorus postdates Pantheon Fossae. In addition, the crater is actually slightly (by about 40 km) offset from the exact center of the Fossae.[1]